From Longman Dictionary of Contemporary Englishdwell on/upon something phrasal verbTHINK ABOUTto think or talk for too long about something, especially something unpleasant That is not a subject I want to dwell on. → dwell→ See Verb table
Examples from the Corpus
dwell on/upon • I have dwelt on it at some length because I believe the opposite to be the case.• Maybe it was better not to dwell on it, he decided.• The episode dwelling on jurist Robert Bork succeeded, for example, despite dominance by Al Franken and Sen.• I was dwelling on negative stuff.• He dwelt on the figure gratefully.• Ruth let her eyes dwell on the forest.• It is traditional for politicians to dwell on the negative.• We need not dwell on the sexist nature of such myths. 